OpenSSH 8.2 Improper Input Validation Vulnerability

Summary

The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client’s download directory by creating a crafted subdirectory anywhere on the remote server.

Credit:

The information has been provided by Vendor

The original article can be found at:https://www.openssh.com/txt/release-8.3


Details

The victim must use the command scp -rp to download a file hierarchy containing, anywhere inside, this crafted subdirectory. NOTE: the vendor points out that “this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol” and “utimes does not fail under normal circumstances.”

 

Vulnerable Systems:

OpenSSH 8.2 

 

CVE Information:

CVE-2020-12062

Disclosure Timeline:
Published Date:6/1/2020

Categories: FeaturedNews